Hi, each 3.2v cell is 74ah, and when you add them in series, the voltage increases but the amp hours stay the same. So, eight cells would be 24v (technically 25.6v) with 74ah. 16 of these cells is 48v (technically 51.6v) with 74 amp hours. If you put the cells in parallel, then the voltage stays the same, but the amp hours increase. So two of these 3.2v cells in parallel is still 3.2v, but 148 amp hours. 8 of these in parallel would still be 3.2v but 592 amp hours. The lead acid batteries are the same concept. Each 12.8v is 75 ah, and when you put them in series, the voltage increases but the amp hours stay 75ah. So four 12v lead acid in series creates a 48v battery with 75ah. If you put four 12v batteries in parallel, then you have a 12v battery with 300 amp hours. Thanks for the comment and watching the videos!